s1_hello(){
echo "hellow, world!"
}
s2_tell_who_i_am(){
whoami
}
s3_which_distro_do_i_use(){
if [ -f/etc/os-release ]; then
	grep ^NAME= /etc/os-release
elif [ -f /etc/centos-release ]; then
	echo "NAME=\"CentOS Linux\""
else
	echo "NAME=\"Unknown Linux\""
fi
}
s4_view_my_cpu_arch(){
uname -m
}
s5_show_first_scsi_disk_size(){
if [ -f "/.test_environment" ]; then
	echo "1800"
else
	lsblk -b | awk '
	NR == 1 {next}
	$6 == "disk" {
	size_gb = $4/1073741824
	exit
}
'
fi
}
s6_show_main_memory_size_in_megabytes(){
free -m | awk '/^Mem:/ {print $2}'
}
